Fix SBGEMM BFLOAT16 build

.github/workflows/arm64_graviton.yml

@@ -88,13 +88,14 @@ jobs:
         run: |
           case "${{ matrix.build }}" in
             "make")
-              make -j$(nproc) DYNAMIC_ARCH=1 USE_OPENMP=0 FC="ccache ${{ matrix.fortran }}"
+              make -j$(nproc) DYNAMIC_ARCH=1 BUILD_BFLOAT16=1 USE_OPENMP=0 FC="ccache ${{ matrix.fortran }}"
               ;;
             "cmake")
               mkdir build && cd build
               cmake -DDYNAMIC_ARCH=1 \
                     -DNOFORTRAN=0 \
                     -DBUILD_WITHOUT_LAPACK=0 \
+                    -DBUILD_BFLOAT16=1 \
                     -DCMAKE_VERBOSE_MAKEFILE=ON \
                     -DCMAKE_BUILD_TYPE=Release \
                     -DCMAKE_Fortran_COMPILER=${{ matrix.fortran }} \

cmake/cc.cmake

@@ -211,14 +211,14 @@ endif ()
 if (${CORE} STREQUAL NEOVERSEV1)
   if (NOT DYNAMIC_ARCH)
     if (${CMAKE_C_COMPILER_ID} STREQUAL "PGI" AND NOT NO_SVE)
-	set (CCOMMON_OPT  "${CCOMMON_OPT} -Msve_intrinsics -march=armv8.4-a+sve -mtune=neoverse-v1")
+	set (CCOMMON_OPT  "${CCOMMON_OPT} -Msve_intrinsics -march=armv8.4-a+sve+bf16 -mtune=neoverse-v1")
     elseif (${CMAKE_C_COMPILER_ID} STREQUAL "NVC" AND NOT NO_SVE)
 	set (CCOMMON_OPT  "${CCOMMON_OPT} -tp=neoverse-v1")
     else ()
       if (${GCC_VERSION} VERSION_GREATER 10.4 OR ${GCC_VERSION} VERSION_EQUAL 10.4)
-        set (CCOMMON_OPT  "${CCOMMON_OPT} -march=armv8.4-a+sve -mtune=neoverse-v1")
+        set (CCOMMON_OPT  "${CCOMMON_OPT} -march=armv8.4-a+sve+bf16 -mtune=neoverse-v1")
       else ()
-        set (CCOMMON_OPT "${CCOMMON_OPT} -march=armv8.2-a+sve")
+        set (CCOMMON_OPT "${CCOMMON_OPT} -march=armv8.2-a+sve+bf16")
       endif()
     endif()
   endif ()

cmake/system.cmake

@@ -291,10 +291,10 @@ if (DEFINED TARGET)
 
 if (${TARGET} STREQUAL NEOVERSEV1)
     if (${CMAKE_C_COMPILER_ID} STREQUAL "PGI" AND NOT NO_SVE)
-	set (KERNEL_DEFINITIONS  "${KERNEL_DEFINITIONS} -Msve_intrinsics -march=armv8.4-a+sve -mtune=neoverse-v1")
+	set (KERNEL_DEFINITIONS  "${KERNEL_DEFINITIONS} -Msve_intrinsics -march=armv8.4-a+sve+bf16 -mtune=neoverse-v1")
     else ()
     if (CMAKE_C_COMPILER_VERSION VERSION_GREATER 10.4 OR CMAKE_C_COMPILER_VERSION VERSION_EQUAL 10.4)
-      set (KERNEL_DEFINITIONS  "${KERNEL_DEFINITIONS} -march=armv8.4-a+sve -mtune=neoverse-v1")
+      set (KERNEL_DEFINITIONS  "${KERNEL_DEFINITIONS} -march=armv8.4-a+sve+bf16 -mtune=neoverse-v1")
     else ()
 	    message(FATAL_ERROR "Compiler ${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_VERSION} does not support Neoverse V1.")
     endif()

driver/level3/level3.c

@@ -1,5 +1,6 @@
 /*********************************************************************/
 /* Copyright 2009, 2010 The University of Texas at Austin.           */
+/* Copyright 2025 The OpenBLAS Project.                              */
 /* All rights reserved.                                              */
 /*                                                                   */
 /* Redistribution and use in source and binary forms, with or        */
@@ -305,7 +306,7 @@ int CNAME(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n,
       }
 
       BLASLONG pad_min_l = min_l;
-#if defined(HALF)
+#if defined(BFLOAT16)
 #if defined(DYNAMIC_ARCH)
       pad_min_l = (min_l + gotoblas->sbgemm_align_k - 1) & ~(gotoblas->sbgemm_align_k-1);
 #else

driver/level3/level3_thread.c

@@ -1,6 +1,6 @@
 /*********************************************************************/
 /* Copyright 2009, 2010 The University of Texas at Austin.           */
-/* Copyright 2023 The OpenBLAS Project.                              */
+/* Copyright 2023, 2025 The OpenBLAS Project.                        */
 /* All rights reserved.                                              */
 /*                                                                   */
 /* Redistribution and use in source and binary forms, with or        */
@@ -324,7 +324,7 @@ static int inner_thread(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n,
 
     BLASLONG pad_min_l = min_l;
 
-#if defined(HALF)
+#if defined(BFLOAT16)
 #if defined(DYNAMIC_ARCH)
     pad_min_l = (min_l + gotoblas->sbgemm_align_k - 1) & ~(gotoblas->sbgemm_align_k-1);
 #else

getarch.c

@@ -1,5 +1,5 @@
 /*****************************************************************************
-Copyright (c) 2011-2014, The OpenBLAS Project
+Copyright (c) 2011-2014, 2025 The OpenBLAS Project
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -1476,7 +1476,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        "-DL2_SIZE=1048576 -DL2_LINESIZE=64 -DL2_ASSOCIATIVE=16 " \
        "-DDTB_DEFAULT_ENTRIES=64 -DDTB_SIZE=4096 " \
        "-DHAVE_VFPV4 -DHAVE_VFPV3 -DHAVE_VFP -DHAVE_NEON -DHAVE_SVE -DARMV8 " \
-       "-march=armv8.4-a+sve -mtune=neoverse-v1"
+       "-march=armv8.4-a+sve+bf16 -mtune=neoverse-v1"
 #define LIBNAME   "neoversev1"
 #define CORENAME  "NEOVERSEV1"
 #endif

lapack/CMakeLists.txt

@@ -52,7 +52,7 @@ GenerateNamedObjects("laswp/generic/laswp_k_4.c" "" "laswp_plus" false "" ""  fa
 GenerateNamedObjects("laswp/generic/laswp_k_4.c" "MINUS" "laswp_minus" false "" ""  false 3)
 
 foreach (float_type ${FLOAT_TYPES})
-if (${float_type} STREQUAL "HALF")
+if (${float_type} STREQUAL "BFLOAT16")
  continue()
 endif()
 GenerateNamedObjects("getrf/getrf_single.c" "UNIT" "getrf_single" false "" "" false ${float_type})

lapack/potrf/potrf_parallel.c

@@ -1,5 +1,6 @@
 /*********************************************************************/
 /* Copyright 2009, 2010 The University of Texas at Austin.           */
+/* Copyright 2025 The OpenBLAS Project.                              */
 /* All rights reserved.                                              */
 /*                                                                   */
 /* Redistribution and use in source and binary forms, with or        */
@@ -405,7 +406,7 @@ static int thread_driver(blas_arg_t *args, FLOAT *sa, FLOAT *sb){
 #elif defined(DOUBLE)
   mode  =  BLAS_DOUBLE  | BLAS_REAL;
   mask  = MAX(DGEMM_UNROLL_M, DGEMM_UNROLL_N) - 1;
-#elif defined(HALF)
+#elif defined(BFLOAT16)
   mode  =  BLAS_HALF  | BLAS_REAL;
   mask  = MAX(SBGEMM_UNROLL_M, SBGEMM_UNROLL_N) - 1;
 #else